diff --git a/CHANGELOG.md b/CHANGELOG.md
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,7 @@
+# 0.1.2.0
+
+* Package now compiles with `-O2` and other optimisations by default.
+
 # 0.1.1.0
 
 * Added `zoom` and `magnify`.
diff --git a/microlens-mtl.cabal b/microlens-mtl.cabal
--- a/microlens-mtl.cabal
+++ b/microlens-mtl.cabal
@@ -1,5 +1,5 @@
 name:                microlens-mtl
-version:             0.1.1.0
+version:             0.1.2.0
 synopsis:            microlens support for Reader/Writer/State from mtl
 description:
   This package contains functions (like 'view' or '+=') which work   
@@ -30,5 +30,11 @@
                      , mtl >=2.0.1 && <2.3
                      , transformers >=0.2 && <0.5
                      , transformers-compat >=0.4 && <1
+
+  ghc-options:
+    -Wall -fwarn-tabs
+    -O2 -fdicts-cheap -funbox-strict-fields
+    -fmax-simplifier-iterations=10
+
   hs-source-dirs:      src
   default-language:    Haskell2010